Title Strong-wind events and their influence on the formation of snow dunes; observations from Kohnen Station, Dronning Maud Land, Antarctica
Author Birnbaum, G.; Freitag, J.; Brauner, R.; König-Langlo, G.; Schulz, E.; Kipfstuhl, S.; Oerter, H.; Reijmer, C.H.; Schlosser, E.; Faria, S.H.; Ries, H.; Loose, B.; Herber, A.; Duda, M.G.; Powers, J.G.; Manning, K.W.; van den Broeke, M.R.
Author Affil Birnbaum, G., Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany. Other: University of Applied Sciences, Germany; Leibniz Institute for Baltic Sea Research Warnemünde, Germany; Utrecht University, Netherlands; University of Innsbruck, Austria; University of Göttingen, Germany; University of Hamburg, Germany; National Center for Atmospheric Research
Source Journal of Glaciology, 56(199), p.891- 902, . Publisher: International Glaciological Society, Cambridge, United Kingdom. ISSN: 0022-1430
Publication Date 2010
Notes In English. 38 refs. Ant. Acc. No: 91605. GeoRef Acc. No: 310365
Index Terms firn; ice; meteorology; snow; snowdrifts; temperature; velocity; weather observations; wind (meteorology); wind velocity; Antarctica--Queen Maud Land; Antarctica; cores; drifting snow; Kohnen Station; Queen Maud Land; winds
Abstract Analyses of shallow cores obtained at the European Project for Ice Coring in Antarctica (EPICA) drilling site Kohnen station on the plateau of Dronning Maud Land reveal the presence of conserved snow dunes in the firn. In situ observations during three dune formation events in the 2005/06 austral summer at Kohnen station show that these periods were characterized by a phase of 2 or 3 days with snowdrift prior to dune formation which only occurred during high wind speeds of ›10 m s-1 at 2 m height caused by the influence of a low-pressure system. The dune surface coverage after a formation event varied between 5% and 15%, with a typical dune size of (4±2) m×(8±3) m, a maximum height of 0.2±0.1 m and a periodicity length of about 30 m. The mean density within a snow dune varied between 380 and 500 kg m- 3, whereas the mean density at the surrounding surface was 330±5 kg m-3. The firn cores covering a time-span of 22±2 years reveal that approximately three to eight events per year occurred, during which snow dunes had been formed and were preserved in the firn.
URL http://hdl.handle.net/10.3189/002214310794457272
Publication Type journal article
Record ID 65007206